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Filtering by: Advisor Pett-Ridge, Julie Remove constraint Advisor: Pett-Ridge, Julie Decade 2010-2019 Remove constraint Decade: 2010-2019

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  • Understanding Molybdenum Isotope Dynamics in Terrestrial Environments

    Creator:
    King, Elizabeth K.
    Abstract:
    This dissertation works towards determining the mechanisms driving the Mo isotopic composition of soils, and how these signals may be used to refine the use of Mo as a proxy of biogeochemical processes. The first step towards quantifying Mo fractionation in soils is to determine the mechanisms controlling Mo accumulation,...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________ Julie C. Pett-Ridge This dissertation works towards determining the mechanisms driving

  • Spatial variability of dust deposition in the Luquillo Mountains, Puerto Rico

    Creator:
    McClintock, Matthew
    Abstract:
    Dust deposition on ecosystems with highly weathered soils may provide vital rock-derived nutrients that maintain ecosystem productivity. Because of the difficulties in measuring temporally and spatially heterogeneous dust deposition over ecologically meaningful timescales, evaluations of the spatial variability in dust deposition are extremely rare. In the Luquillo Mountains of Puerto...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Julie Pett-Ridge Dust deposition on ecosystems with highly weathered soils may

  • Interactions between ecosystem nitrogen and bedrock control long-term calcium sources in Oregon Coast Range forests

    Creator:
    Hynicka, Justin D.
    Abstract:
    Ecosystem nitrogen (N) supply strongly influences the availability and cycling of other essential nutrients in temperate forests, especially calcium (Ca). Short-term additions of N that exceed ecosystem demands often increase dissolved nitrate fluxes and decrease soil pH, which can stimulate soil Ca loss. However, the long-term effects of high N...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________ Steven S. Perakis Julie Pett-Ridge Ecosystem nitrogen (N) supply strongly influences

  • Interactions between nitrogen, phosphorus, and molybdenum in forest soils and cyanobacterial lichen in the Oregon Coast Range

    Creator:
    Marks, Jade A.
    Abstract:
    Molybdenum is an essential component of biogeochemical cycling, most notably as a component of the nitrogenase enzyme used in biological nitrogen (N) fixation. While the important role of phosphorus (P) in limiting N fixation in ecosystems has been well documented, occurrence and prevalence of molybdenum (Mo) limitation is largely unknown....
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________ Julie Pett-Ridge Bruce McCune Molybdenum is an essential component of

  • The Effects of Layered Differences in Hydraulic Conductivity of Groundwater : An Estimation of Residence Time for Solute Transport

    Creator:
    McCarthy, Alexander J.
    Abstract:
    In order to determine how contaminants from pharmaceutical, agriculture, and industry will move through groundwater systems, it is imperative to further our understanding of the relationship between physical, biological, and chemical properties of aquifers and transport and transformation of these products. Several studies have explored how heterogeneities in groundwater systems...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ John S. Selker, Julie Pett-Ridge In order to determine how